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9e0ef45048
Prior to this commit, passing a NULL stack to `bitcoin_tx_input_set_witness` unsets the witness stack on the bitcoin_tx's wally_tx but leaves the final witness on the PSBT unchanged. at the moment, libwally's `wally_psbt_input_set_final_witness` will blow up if you attempt to set a NULL witness -- instead we manually remove it if the passed in stack is NULL. previously we would leave the PSBT's witness unchanged.
These are standard bitcoin manipulation routines which should be provided by any normal bitcoin library in whatever language you choose. The ones here are standalone ones taken from bitcoin core and some I wrote, many taken from bitcoin-iterate and pasted in here.